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CHAPTER 8 TROUBLESHOOTING
8
8.2 Troubleshooting for Output Circuit
(5) The load operates due to powering on the external power supply (transistor
output).
(6) The load operates by incorrect input due to chattering of the external power
supply.
Case
Cause
• The polarity of the external power supply is connected in reverse.
• When the polarity is connected in reverse, current may flow across an output element protection diode.
Action Connect the polarity correctly.
Case
Cause The device whose input response speed is too fast is connected to the contact output module.
Action Use a transistor output module.
Load
External
power
supply
Y0
COM
Incorrect Correct
Transistor
output module
Output element
protection diode